Parsing a text file line by line in ksh

This is how to parse a file line by line in ksh :


while read line
do
run you commands here
done < text_file.txt


Enabling xvid codec in Ubuntu 8.04

I usually convert video using a 2 pass process with ffmpeg. The command line is :

date;ffmpeg -i myinputfile.mpg -pass 1 -passlogfile vts.log -qscale 2 -vcodec xvid VTS_02_temp.avi;date;ffmpeg -i myinputfile.mpg -f avi -vcodec xvid -pass 2 -passlogfile vts.log -b 800 -g 300 -bf 2 -acodec mp3 -ab 128 myoutputfile.avi;date

When I tried to the first time on my new ubuntu 8.04, I got this error message :
Unknown codec 'xvid'

After googling on the web, I found the solution. The xvid codec along other non free codecs are not included in the Ubuntu repository. We need to use a separate repository call Medibuntu. This repository contains everything free and non-free for all the video processing needs. The web site is hosted on http://medibuntu.org.

A complete installation procedure is on the repository how-to section of the web site. In short, if you're using Ubuntu 8.04 on i386 architecture, these are the steps you need to enable the new repository :

sudo wget http://www.medibuntu.org/sources.list.d/hardy.list -O /etc/apt/sources.list.d/medibuntu.list
sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update

Then you open up Synaptic package manager and do a search on ffmpeg and xvid. you should see quite a few files that need upgrade (a little yellow star on the package icon). Upgrade all packages and you should now be able to encode using xvid codec.